Freescale Semiconductor, Inc.
I/O Ports with Key Wake-up
Key Wake-up and Port Registers
KWPJ — Key Wake-up Port J Polarity Register
$0030
Bit 7
KWPJ7
0
6
KWPJ6
0
5
KWPJ5
0
4
KWPJ4
0
3
KWPJ3
0
2
KWPJ2
0
1
KWPJ1
0
Bit 0
KWPJ0
0
RESET:
Read and write anytime. It is best to clear the flags after initializing this
register because changing the polarity of a bit can cause the associated
flag to become set.
KWPJ[7:0] — Key Wake-up Port J Polarity Selects
0 = Falling edge on the associated port J pin sets the associated
flag bit in the KWIFJ register and a resistive pull-up device is
connected to associated port J input pin.
1 = Rising edge on the associated port J pin sets the associated
flag bit in the KWIFJ register and a resistive pull-down device
is connected to associated port J input pin.
KWPH — Key Wake-up Port H Polarity Register
$0031
Bit 7
KWPH7
0
6
KWPH6
0
5
KWPH5
0
4
KWPH4
0
3
KWPH3
0
2
KWPH2
0
1
KWPH1
0
Bit 0
KWPH0
0
RESET:
Read and write anytime. It is best to clear the flags after initializing this
register because changing the polarity of a bit can cause the associated
flag to become set.
KWPH[7:0] — Key Wake-up Port H Polarity Selects
0 = Falling edge on the associated port H pin sets the associated
flag bit in the KWIFH register and a resistive pull-up device is
connected to associated port H input pin.
1 = Rising edge on the associated port H pin sets the associated
flag bit in the KWIFH register and a resistive pull-down device
is connected to associated port H input pin.
MC68HC912DG128 — Rev 3.0
Technical Data
I/O Ports with Key Wake-up
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